What a great read! Not only was the flow of the story flawless, the grammar was "almost" spotless. I suggest passing it once through a grammar checker. It's nothing major, though, so it's fine as is.
While reading this, I was reminded of a few anime I've watched long before... To be specific, "No Game No Life" and "Goblin Slayer". Thanks to that, I had a pretty solid image of the world you're building.
All in all, a wonderful story that I would definitely recommend to others. Great work, Author! Keep up the chapters~!